Boots – shoes – and leggings
Patent
1988-03-22
1990-04-17
Lall, Parshotam S.
Boots, shoes, and leggings
375 34, G06K 936, G06K 940
Patent
active
049186337
ABSTRACT:
A method for reducing noise in an image signal includes the steps of sampling an image to produce a sampled image signal representing pixel amplitude values, the sampled image signal including noise having a known probabilty density function (pdf); digitizing the pixel amplitude values to produce a digital image; forming an image difference signal from the digital image signal by taking the difference between successive pixel amplitude values; processing the image difference signal in digital processing means including a digital MAP filter incorporating a MAP estimator for estimating the signal and noise pdf's of a signal having a Laplacian pdf degraded by noise having a know pdf, to produce a MAP filtered image difference signal; and recovering a restored digital image signal from the MAP filtered image difference signal by summing successive amplitude difference values in the MAP filtered image difference signal. Since the pdf of the differential image signal is more nearly stationary than the image signal itself, a MAP estimator based on a differential image signal provides a more reliable estimate of the original signal statistics, even though the statistics of original signal may vary widely.
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Pratt, "Digital Image Processing", pp. 18-19, .COPYRGT.1978, John Wiley & Sons, Inc.
Close Thomas H.
Eastman Kodak Company
Lall Parshotam S.
Melnick Steven A.
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